document.write(
    `<nav>
    <div>
        <img src="./img/qiyin.png" alt="">
    </div>
    <div>东方启音</div>
    <div>
        <span onclick="showMenu()" class="iconfont icon-liebiao2"></span>
    </div>
    <div class="menu">
    </div>
</nav>`
)